Two battles on July 26, 1865 near Platte Bridge Station near present-day Casper, Wyo., are best understood in the context of tribal response to the Sand Creek Massacre the previous November. Twenty-eight U.S. troops were killed that day including Lt. Caspar Collins, for whom Fort Caspar and the town of Casper were later named.
The Fetterman Battlefield, southeast of present Story, Wyo., marks the spot where Capt. William Fetterman and all 80 men under his command were killed Dec. 21, 1866 by Lakota Sioux, Cheyenne and Arapaho Indians.